Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  shrillness(noun) the quality of being sharp or harsh to the senses. the shrillness of her hair color. 2  shrillness, stridence, stridency(noun) having the timbre of a loud high-pitched sound.
VPN connectivity overview. A virtual private network, also known as a VPN, is a private network that extends across a public network or internet. It enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.
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